Users loose "role" after updating details

I tried adding a new Role called “Media Uploader” which worked perfectly excerpt that now, when ever I update a users profile they all loose their roles (no role for this site).

I removed the role I created but it seems the damage is done. Any user now who changes anything in their profile looses their role.

Any suggestions where to troubleshoot or what to would be much appreciated.

The code I used to create my role:

remove_role('media_uploader', 'Media Uploader', array(
    'read' => true,
    'upload_files' => true,
    'unfiltered_uploads' => true
    ));